Materials Literature
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The light-emission and current-voltage properties of n-type nanoporous silicon (n-NPS) with a hole assistance of buried p layer are explored. The influences of anodic current density on the formation, morphology, and properties of n-NPS are measured. Such n-NPS films have nanoscaled pores and high-aspect-ratio pillars…
Abstract This article reports the synthesis, characterization, and damping characteristics of semi‐interpenetrating (semi‐IPN) latex systems composed of poly n ‐butyl acrylate (PBA) core and poly n ‐butyl methacrylate (PBMA) shell. The IPN's were prepared by seeded emulsion polymerization using crosslinked PBA seeds w…
The authors found experimentally that carbon nanotube field-effect transistors (CNFETs) could exhibit n-type characteristics even though their electrodes consist of a large-work-function metal such as Co. To explain their result, which is contrary to the general belief that CNFETs with large-work-function electrodes a…
Abstract A new diamine monomer containing flexible sulfone, sulfide, and amide units was prepared via three steps. Nucleophilic chloro displacement reaction of 4‐aminothiophenol with 4‐nitrobenzoyl chloride in the presence of propylene oxide afforded N ‐(4‐mercapto‐phenyl)‐4‐nitrobenzamide and subsequent reduction of…
It has been attempted to derive the structural properties of bulk multiwall carbon nanotubes (MWCNTs) from a combination of powder diffraction and principal component analysis (PCA). By a transformation of the direct PCA basis functions to a structural parameter set it was possible to obtain average values of inner ra…
Abstract Rigid PVC microstructure strongly depends on processing conditions: under both shear and heat influence, gelation process occurs, and the resulting morphology can be characterized by the so‐called gelation level parameter. But thermomechanical history also affects several other features of the microstructure.…
Abstract Polyimide/silica (PI/SiO 2 ) nanocomposite films with 10 wt % of silica content were prepared by sol–gel process under the conditions with and without additional water. The presence of additional water has great effect on the silica particle size and thus on the properties of the prepared PI/SiO 2 films. The…
Abstract In this study, three kinds of L ‐lactide‐based copolymers, poly(lactide‐co‐glycolide) (PLGA), poly(lactide‐co‐ p ‐dioxanone) (PLDON) and poly(lactide‐co‐caprolactone) (PLC), were synthesized by the copolymerization of L ‐lactide (L) with glycolide (G), or p ‐dioxanone (DON) or ε‐caprolactone (CL), respectivel…
A liquid laser medium with a lifetime of 492μs and a fluorescent quantum efficiency of 52.5% has been presented by stably dispersing dimethyl dichorosilane-modified Nd2O3 nanoparticles in dimethylsulfoxide. Its optical properties and mechanism were investigated and explained by fluorescence resonance energy transfer t…
Abstract A polymeric hindered amine light stabilizer (HALS), where HALS moiety was attached at the terminal end of the polypropylene chain via end‐functionalized vinylidine PP through simple organic reactions, was synthesized. It comprises the synthesis of vinylidine‐terminated polypropylene by using Cp 2 ZrCl 2 /MAO…
The article reports on low-temperature high-rate sputtering of hydrophilic transparent TiO2thin films using dc dual magnetron (DM) sputtering in Ar + O2mixture on unheated glass substrates. The DM was operated in a bipolar asymmetric mode and was equipped with Ti(99.5) targets of 50 mm in diameter. The substrate surfa…
Abstract The generation of nanocomposites upon intercalation and exfoliation of clay tactoids using melt compounding is a difficult process. In this study various polymeric binders were melt compounded with organophilic clay particles using myriad methods, including sonication, batch mixing, and twin screw extrusion.…
Abstract Calcium carbonate (CaCO 3 )‐filled low‐density polyethylene (LDPE)/linear low‐density polyethylene (LLDPE) composites were fabricated by means of a twin‐screw extruder, and the tensile mechanical properties of the tubing with thickness of 0.5 mm made from these composites were measured at room temperature to…
Abstract The first part of this investigation focused on the synthesis and characterization of a microencapsulated intumescent flame retardant (MIFR) agent. Two steps were used in the synthesis process. The structure was characterized by scanning electron microscopy, thermogravimetric anaylysis, and Fourier transform…
The critical voltage with an arbitrary pretilt angle is given analytically which is consistent with the numerical results [Acosta et al., Liq. Cryst. 27, 977 (2000)]. The author’s results show that the critical voltage is dependent on the parameters of liquid crystal and pretilt angle but is independent of the cell ga…
One of the greatest bottlenecks in producing recombinant proteins in Escherichia coli is that over-expressed target proteins are mostly present in an insoluble form without any biological activity. DCase (N-carbamoyl-D-amino acid amidohydrolase) is an important enzyme involved in semi-synthesis of beta-lactam antibiot…
This letter is a report on hybrid double walled nanotubes (HDWNTs) of crystalline ferromagnetic nickel (Ni) nanotubes encapsulated conducting polypyrrole (PPy) nanotubes through a sequentially electrochemical synthetic method. Ferromagnetic Ni nanotubes were fabricated by an electrochemical deposition method outside t…
Static magnetic measurements have been applied for the pressure-induced superconducting state in the P 2 1 / m phase of EtMe 3 P[Pd(dmit) 2 ] 2 (Et = C 2 H 5 , Me = CH 3 and dmit 2- = 1,3-dithiol-2-thione-4,5-dithiolate, C 3 S 5 2- ), which exhibits valence bond (VB) ordering with a spin gap at ambient pressure. Evide…
Abstract By oxidative coupling polymerization of the macromonomer of oligoaniline and p ‐phenylenediamine we have prepared a novel electroactive polyamide, exhibiting well‐defined molecular structure, interesting spectroscopic and electrochemical properties. The well‐defined molecular structure of the electroactive po…
The authors present a spectroscopic analysis of a planar split-ring-resonator (SRR) medium at terahertz frequencies, quantitatively characterizing the associated magnetic resonance. Experimental quantification at terahertz and infrared frequencies of metamaterial optical constants has been primarily absent, largely du…